What is a Dept 90?

What is a Dept 90?

DEPT 90 NMR Data. Experimental Description - DEPT 90, Distortionless Enhancement of Polarization Transfer using a 90 degree decoupler pulse. Spectral Interpretation - This pulse sequence produces a carbon spectrum containing only carbons with a single attached proton.

What does Dept mean in NMR?

Distortionless Enhancement by Polarization Transfer Distortionless Enhancement by Polarization Transfer (DEPT) is a double resonance pulse program that transfers polarization from an excited nucleus to another – most commonly 1H → 13C.

What does a Dept 135 tell you?

The DEPT experiment differentiates between CH, CH2 and CH3 groups by variation of the selection angle parameter (the tip angle of the final 1H pulse): 135° angle gives all CH and CH3 in a phase opposite to CH2; 90° angle gives only CH groups, the others being suppressed; 45° angle gives all carbons with attached ...

What is Deptq?

DEPTQ is similar to the DEPT experiment but it also allow us to detect non protonated carbons. Below, the different carbon signals observed on a DEPTQ and on a DEPT are detailed. Blue and red indicate signal phase up or down respectively. DEPTQ 45.

What are DEPT spectra?

Distortions Enhancement by Polarization Transfer (DEPT) DEPT experiments are used for distinguishing between a CH3 group (methyl), a CH2 group (methylene), and a CH group (methine). The proton pulse is set at 45°, 90°, or 135° in the three separate experiments.

How does a DEPT experiment work?

Distortionless Enhancement by Polarization Transfer (DEPT) is an experiment that utilizes a polarization transfer from one nucleus to another, usually proton to carbon or other X nucleus, to increase the signal strength of the X nucleus. ... Inspection of the spectra will show the multiplicity of each carbon.

WHAT IS A DEPT-135 spectrum?

The DEPT-135 gives signals of all protonated carbons, but CH and CH3 signals are positive, while CH2 peaks are negative. The signals of quaternary carbons are absent in all the DEPT spectra. By combining the DEPT-45, DEPT-90 and DEPT-135 spectra, it is possible to determine multiplicity of each carbon signal.

What is DEPT spectrum?

Distortionless enhancement by polarization transfer spectra Distortionless enhancement by polarization transfer (DEPT) is an NMR method used for determining the presence of primary, secondary and tertiary carbon atoms.

Does Dept 135 show quaternary carbons?

In the DEPT-135 experiment, CH3 and CH groups give positive signals and CH2 groups give negative signals. Quaternary carbons (those having no attached hydrogens) can be identified because they are in the original 13C spectrum but they do not appear in either of the DEPT spectra.

What is a DEPT experiment?

Distortionless Enhancement by Polarization Transfer (DEPT) is an experiment that utilizes a polarization transfer from one nucleus to another, usually proton to carbon or other X nucleus, to increase the signal strength of the X nucleus. ... Inspection of the spectra will show the multiplicity of each carbon.

What is the difference between Dept 90 and Dept 135?

• DEPT-90 and DEPT-135 are different types of DEPT experiment and we won’t go over the mechanisms here but rather use this data as it is. The aim of this article to explain the application of DEPT in solving NMR spectra. As an example, lets see this (stimulated) 13 C NMR combined with the DEPT experiments:

Where is the 90th Precinct in Brooklyn?

• The 90th Precinct serves the northwestern portion of Brooklyn that mainly consists of the neighborhood of Williamsburg. Find your sector. Find your NCOs. Neighborhood Coordination Officers, or NCOs, are your local problem solvers.

What exactly is dept-45?

• Well, DEPT-45 leaves all resonances with a positive phase (so pretty similar to a basic 1D except that due to polarization transfer, you can get the spectrum much faster – with the exception of quaternary carbons).

What does dedept stand for?

• DEPT is an acronym for Distortionless Enhancement by Polarization Transfer. This experiment allows to determine multiplicity of carbon atom substitution with hydrogens. For this purpose, three experiments need to be recorded, where pulse with φ3 has flip angle of 45o (a), 90o (b), and 135o (c).